Breast cancer survivors can have a lot of post-treatment problems, such as fatigue, depression, and a decrease in physical function. It is possible that physical activities, like yoga, could help ease these symptoms. This study wanted to learn how yoga affects fatigue, immune function, and mood of women treated for breast cancer. The researchers wanted to enroll up to 250 volunteers from the Army of Women (AOW) from Columbus, OH. The Call to Action for this study was sent to AOW members on February 23, 2009. The researchers closed enrollment on June 18th, 2009, after the AOW provided them with 23 women who were interested in enrolling in the study.